1977-02-22
1978-08-29
Evans, F. L.
350287, G02B 508
Patent
active
041100115
ABSTRACT:
A periscope has a pair of transparent, generally prismatic-shaped blocks which are mounted vertically with respect to each other within a protective housing that extends through an opening in an armored vehicle for safely viewing an exterior field of view from within the vehicle. The top block has an uppermost exterior field of view viewing surface and an adjacent reflector surface, with the bottom block having a bottommost interior observer viewing surface and an adjacent reflector surface, with the viewing surfaces being on diagonally opposite ends of the periscope. A beam splitter is mounted between the pair of blocks adjacent a second observer viewing surface which is formed on the bottom portion of the top block, located either exteriorly or interiorly of the armored vehicle. Exterior light beams entering through the exterior viewing surface are reflected downwardly through the block by the top reflector surface. A predetermined percentage of each of these reflected light beams is reflected by the beam splitter out of the second observer viewing window with the remaining unreflected portion of each light beam passing through said beam splitter and lower block. These unreflected light beam portions in turn are reflected out of the bottommost observer viewing window, thereby providing a pair of observer viewing windows in a periscope having a single exterior field of view viewing window.
REFERENCES:
patent: 2591752 (1952-04-01), Wicklund
Evans F. L.
Miller-Holzwarth, Inc.
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